I remember back in the early 80’s checking out my grandmothers attic. Gas lines to all the rooms for lighting. House built in 1903. Also upgraded to electric at some time. Wiring was on glass insulators. Surprised some of this old houses are still here.I've seen some houses in Kay County that have those gas lamp sconces.
Yours was propane.
Back in the day when the pipe line companies wanted to get an easement across a property, they offered the landowner a tap in the line and a regulator to supply gas to the home vs a cash payment.
They didn't understand carbon monoxide at that time evidently and the houses weren't as tight back then, actually pretty drafty which probably saved the occupants.
A co-worker moved into one in the 80's having some health issues later that were attributed to exposure of low doses of Carbon monoxide.
RV's have CO detectors now by law as everything is propane powered in the kitchens as you well know but others don't.